Lithium battery energy storage system and vehicle

Abstract

The utility model relates to a lithium battery energy storage system and a vehicle, and belongs to the field of battery management systems. The lithium battery energy storage system comprises a battery management system and a fire extinguishing system connected with a display control module in the battery management system, for each battery cluster, the battery management system comprises slave control modules correspondingly connected with battery packs in each battery cluster, a master control module connected with each slave control module through a CAN bus, and a display control module connected with the master control module through respective corresponding communication interfaces, wherein each slave control module further comprises a DO interface connected with a fire fighting system; the DO interface is used for outputting a DO signal when the temperature of the corresponding battery pack is equal to or greater than a preset temperature; and the fire extinguishing system is used for starting by using a DO signal under the condition of CAN communication failure. According to the utility model, when CAN communication fails, normal use of a fire extinguishing system is ensured, and occurrence of battery fire is reduced.

Description

Technical Field

[0001] This utility model relates to a lithium battery energy storage system and a vehicle, belonging to the field of battery management systems. Background Technology

[0002] Lithium-ion battery energy storage systems include a battery management system and a fire suppression system connected to the Energy System Management Unit (ESMU) in the battery management system. In lithium-ion battery power systems, overheating or thermal runaway of lithium-ion batteries can affect the safe operation of the energy storage system.

[0003] Currently, the overheating or thermal runaway protection for lithium battery energy storage systems works as follows: The slave module (Energy Storage Battery Management Module, ESBMM) in the battery management system collects data such as voltage and temperature inside the battery module (PACK) and transmits the collected battery information to the master module (Energy Storage Battery Cluster Module, ESBCM) in the battery management system via CAN communication or daisy-chain communication. The ESBCM then transmits the battery information to the ESMU in the battery management system via CAN communication or Ethernet communication. Based on the battery information, the ESMU determines whether to activate the fire suppression system to suppress overheating or thermal runaway and ensure the normal operation of the lithium battery energy storage system.

[0004] Since battery management systems mostly rely on CAN communication to transmit information, if CAN communication fails, the fire protection system will not be able to start, and the over-temperature protection or thermal runaway protection will not function properly, which may lead to battery fire or power system failure, resulting in huge losses. Utility Model Content

[0005] The purpose of this invention is to provide a lithium battery energy storage system and vehicle to solve the problem in the prior art that the fire protection system cannot be started when CAN communication fails.

[0006] To achieve the above objectives, the solution of this utility model includes:

[0007] This utility model discloses a lithium battery energy storage system, including a battery management system and a fire protection system connected to the display and control module in the battery management system. The battery management system includes, for each battery cluster, a slave control module connected to the battery pack in each battery cluster, a master control module connected to each slave control module via a CAN bus, and a display and control module connected to the master control module via their respective communication interfaces. Each slave module also includes a DO interface for connecting to the fire protection system.

[0008] The DO interface is used to output a DO signal when the temperature of the corresponding battery pack is equal to or greater than a preset temperature;

[0009] The fire suppression system is used to activate using the DO signal in the event of CAN communication failure.

[0010] Furthermore, the DO interface is a dry contact interface.

[0011] Furthermore, the lithium battery energy storage system is used to determine CAN communication failure when the display and control module, main control module, or software malfunctions.

[0012] Alternatively, if a communication failure occurs on the CAN bus between the display control module and the main control module, it is determined that the CAN communication has failed.

[0013] Alternatively, if the CAN bus communication between the master control module and each slave control module is lost, it is determined that the CAN communication has failed.

[0014] Furthermore, the lithium battery energy storage system also includes a liquid cooling system connected to the display and control module in the battery management system for cooling the battery pack;

[0015] The liquid cooling system is also used to connect the DO interfaces of each slave control module;

[0016] The liquid cooling system is used to activate the liquid cooling function using the DO signal in the event of CAN communication failure.

[0017] Furthermore, the lithium battery energy storage system also includes a fan connected to the display and control module in the battery management system to facilitate heat exchange between the liquid cooling system and the surrounding air;

[0018] The fan is also used to connect the DO interface of each slave control module;

[0019] The fan is used to operate using the DO signal in case of CAN communication failure.

[0020] This utility model discloses a vehicle, including a lithium battery energy storage system. The lithium battery energy storage system includes a battery management system and a fire protection system connected to the display and control module in the battery management system. For each battery cluster, the battery management system includes: a slave control module connected to the battery pack in each battery cluster, a master control module connected to each slave control module via a CAN bus, and a display and control module connected to the master control module via their respective communication interfaces. Each slave module also includes a DO interface for connecting to the fire protection system.

[0021] The DO interface is used to output a DO signal when the temperature of the corresponding battery pack is equal to or greater than a preset temperature;

[0022] The fire suppression system is used to activate using the DO signal in the event of CAN communication failure.

[0023] Furthermore, the DO interface is a dry contact interface.

[0024] Furthermore, the lithium battery energy storage system is used to determine CAN communication failure when the display and control module, main control module, or software malfunctions.

[0025] Alternatively, if a communication failure occurs on the CAN bus between the display control module and the main control module, it is determined that the CAN communication has failed.

[0026] Alternatively, if the CAN bus communication between the master control module and each slave control module is lost, it is determined that the CAN communication has failed.

[0027] Furthermore, the lithium battery energy storage system also includes a liquid cooling system connected to the display and control module in the battery management system for cooling the battery pack;

[0028] The liquid cooling system is also used to connect the DO interfaces of each slave control module;

[0029] The liquid cooling system is used to activate the liquid cooling function using the DO signal in the event of CAN communication failure.

[0030] Furthermore, the lithium battery energy storage system also includes a fan connected to the display and control module in the battery management system to facilitate heat exchange between the liquid cooling system and the surrounding air;

[0031] The fan is also used to connect the DO interface of each slave control module;

[0032] The fan is used to operate using the DO signal in case of CAN communication failure.

[0033] The beneficial effects of this utility model are as follows: As an improved invention, this utility model provides a lithium battery energy storage system and vehicle, including a battery management system and a fire protection system connected to the display and control module in the battery management system. The battery management system, for each battery cluster, includes: a slave control module corresponding to the battery packs in each battery cluster; a master control module connected to each slave control module via a CAN bus; and a display and control module connected to the master control module via its respective communication interface. Each slave control module also includes: a DO interface for connecting to the fire protection system; the DO interface outputs a DO signal when the temperature of the corresponding battery pack is equal to or greater than a preset temperature; the fire protection system is activated using the DO signal in case of CAN communication failure. By adding a DO interface to each slave control module, and only increasing the wiring harness within the cluster, redundancy is added to the existing scheme of controlling the fire protection system with the display and control module. Under normal circumstances, dual protection is achieved in case of overheating or thermal runaway. In case of CAN communication failure, the fire protection system can still be activated using the DO signal, ensuring the normal operation of the fire protection system, reducing the occurrence of battery fires or power system failures, and thus reducing economic losses. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of a lithium battery energy storage system provided in an embodiment of this utility model. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] The concept of this utility model is to add redundancy to the existing scheme of controlling and starting the fire protection system with the display and control module, so that the fire protection system can still be activated normally when the display and control module fails.

[0037] Specifically: The lithium battery energy storage system includes a battery management system and a fire protection system connected to the display and control module in the battery management system. For each battery cluster, the battery management system includes: a slave control module connected to the battery packs in each battery cluster, a master control module connected to each slave control module via a CAN bus, and a display and control module connected to the master control module via its respective communication interface. Each slave control module also includes: a DO interface for connecting to the fire protection system; the DO interface is used to output a DO signal when the temperature of the corresponding battery pack is equal to or greater than a preset temperature; the fire protection system is used to start using the DO signal in the event of CAN communication failure.

[0038] An embodiment of a lithium battery energy storage system:

[0039] Figure 1 This is a schematic diagram of the structure of a lithium battery energy storage system provided in an embodiment of this utility model, as shown below. Figure 1 As shown, the lithium battery energy storage system includes a battery management system, a fire protection system 40 connected to the display and control module 10 in the battery management system, a main control module 20, and slave control modules connected to the battery packs in each battery cluster.

[0040] Specifically, the communication interface 201 of the main control module 20 is connected to the communication interface 101 of the display and control module 10. The main control module 20 is connected to each slave control module via a CAN bus. The CAN bus is connected to the CAN0 interface of each slave control module and the main control module 20. Each slave control module is also equipped with a DO interface, and each DO interface is used to connect to the fire protection system 40.

[0041] As an optional implementation, the lithium battery energy storage system also includes a liquid cooling system (not shown) connected to the display and control module 10 in the battery management system for cooling the battery pack; in order to achieve dual protection under high temperature or thermal runaway, the DO interface on each slave control module can also be used to connect to the liquid cooling system, that is, the DO interface is connected to both the fire protection system 40 and the liquid cooling system.

[0042] As an alternative implementation, the lithium battery energy storage system also includes a fan (not shown) connected to the display and control module 10 in the battery management system to facilitate heat exchange between the liquid cooling system and the surrounding air. To achieve dual protection against overheating or thermal runaway, the DO interface on each slave control module can also be used to connect to the fan, i.e., the DO interface is connected to both the fire protection system 40 and the fan. Alternatively, the DO interface on each slave control module can also be used to connect to the fire protection system 40, the liquid cooling system, and the fan. The following explanation will exemplify the scenario where the DO interface of each slave control module is only connected to the fire protection system 40.

[0043] The display and control module 10 is used to activate the fire suppression system based on an overheating strategy or a thermal runaway strategy. The overheating strategy or thermal runaway strategy includes different levels of strategies. Taking a three-level strategy as an example, the first level is the overheating strategy or thermal runaway strategy executed when the battery pack temperature is greater than or equal to 55 degrees Celsius (°C) but less than 60°C; the second level is the overheating strategy or thermal runaway strategy executed when the battery pack temperature is greater than or equal to 60°C but less than 65°C; and the third level is the overheating strategy or thermal runaway strategy executed when the battery pack temperature is greater than or equal to 65°C. In this three-level strategy, the third level is the highest level of overheating strategy or thermal runaway strategy, the first level is the lowest level of overheating strategy or thermal runaway strategy, and the second level is the next highest level of overheating strategy or thermal runaway strategy. Regarding the temperature conditions in the three-level strategy, this embodiment uses 55°C, 60°C, and 65°C as examples for illustrative purposes. In practical applications, the temperature conditions of the three-level strategy can be changed, and this invention does not impose any particular limitation on this. The Level 3 strategy is any high-temperature or thermal runaway strategy known to those skilled in the art, and the specific details of the strategy will not be elaborated here.

[0044] The DO interface outputs a DO signal when the temperature of the corresponding battery pack is equal to or greater than a preset temperature. The DO interface is a dry contact interface, and the output DO signal is also a dry contact signal. The DO signal reflects the state of the dry contact and can be either a high-level or low-level signal. Depending on design requirements, the dry contact state can be set to normally open or normally closed; this invention does not impose any particular limitation on this, but it must be ensured that the high and low levels of the output DO signal are consistent when the dry contact states are the same. The preset temperature must be higher than the temperature condition corresponding to the highest level of the overheating or thermal runaway strategy. The following explanation uses a preset temperature of 66°C as an example.

[0045] When all the DO interfaces of the slave control modules are used to connect to the fire protection system 40, the fire protection system 40 can also be started using the DO signal in the event of CAN communication failure. When the fire protection system 40 is started using the DO signal, whether the overheating strategy or thermal runaway strategy executed by the fire protection system 40 is the highest level or the second highest level, etc., this utility model does not specifically limit this. For the protection of the lithium battery power system, and for safety considerations, the following explanation will exemplify the scenario where the fire protection system 40 executes the highest level overheating strategy or thermal runaway strategy when started using the DO signal.

[0046] When the DO interfaces of each slave control module can also be used to connect to the liquid cooling system, the liquid cooling system can use the DO signal to start the liquid cooling function in the event of CAN communication failure; when the DO interfaces of each slave control module can also be used to connect to the fan, the fan can use the DO signal to operate in the event of CAN communication failure.

[0047] When CAN communication is not lost, the display and control module 10 can control the fire protection system 40, the liquid cooling system and the fan to start via CAN communication. When CAN communication fails, the fire protection system 40, the liquid cooling system and the fan can be started using the DO signal. Therefore, a dual-layer protection design for the lithium battery energy storage system can be achieved, thereby reducing the occurrence of safety accidents.

[0048] The determination of CAN communication failure can be as follows: when the lithium battery energy storage system malfunctions in the display and control module 10, the main control module 20, or the software, it can be determined as CAN communication failure; or when the lithium battery energy storage system loses communication on the CAN bus between the display and control module 10 and the main control module 20, it can be determined as CAN communication failure; or when the lithium battery energy storage system loses communication on the CAN bus between the main control module 20 and each slave control module, etc. This utility model does not impose any particular limitation on these aspects.

[0049] The main control module 20 and the display control module 10 can communicate via CAN, LIN, RS485, etc. This utility model does not impose any particular limitation on this.

[0050] When the main control module 20 and the display control module 10 use CAN communication, both the communication interface 201 of the main control module 20 and the communication interface 101 of the display control module 10 are CAN communication interfaces; when the main control module 20 and the display control module 10 use LIN communication, both the communication interface 201 of the main control module 20 and the communication interface 101 of the display control module 10 are LIN communication interfaces; when the main control module 20 and the display control module 10 use RS485 communication, both the communication interface 201 of the main control module 20 and the communication interface 101 of the display control module 10 are RS485 communication interfaces.

[0051] As an optional implementation, the communication interface 201 of the main control module 20 and the communication interface 101 of the display and control module 10 both include a CAN communication interface, a LIN communication interface, and an RS485 communication interface. The corresponding consistent communication interface type can be selected for connection according to communication requirements.

[0052] The following explanation uses CAN communication between the main control module 20 and the display control module 10 as an example, with both the communication interface 201 of the main control module 20 and the communication interface 101 of the display control module 10 being CAN communication interfaces. When CAN communication is used between the main control module 20 and the display control module 10, if the main control module 20 fails to receive information uploaded by the slave control modules via the CAN bus, it is determined that CAN communication has failed.

[0053] The display and control module 10 and the fire protection system 40 can communicate via RS485 or CAN, etc. This utility model does not make any special limitation in this regard.

[0054] One master control module 20 can connect to a maximum of 28 slave control modules. Therefore, the total number of slave control modules connected to each battery group under each battery cluster in the battery management system is 28, that is, N≤28. In other words, the total number of battery groups under each battery cluster is at most 28 groups.

[0055] The following is combined Figure 1 This explains the working principle of the lithium battery power system provided by this utility model.

[0056] Under normal circumstances, the display and control module 10 can receive battery information uploaded by the main control module 20, analyze the battery information, and activate the fire protection system 40 in a timely manner according to the thermal runaway strategy or the overheating strategy. That is, when the temperature of all battery packs is below 55°C, the display and control module 10 does not activate the fire protection system 40; when the temperature of a battery pack is equal to or greater than 55°C but less than 60°C, the display and control module 10 controls the fire protection system 40 to activate, executing the lowest level of overheating strategy or thermal runaway strategy; when the temperature of a battery pack is equal to or greater than 60°C but less than 65°C, the display and control module 10 controls the fire protection system 40 to activate, executing the next highest level of overheating strategy or thermal runaway strategy; when the temperature of a battery pack is equal to or greater than 65°C, the display and control module 10 controls the fire protection system 40 to activate, executing the highest level of overheating strategy or thermal runaway strategy; when the temperature of a battery pack is equal to or greater than 66°C, the fire protection system 40 can receive both the communication signal from the display and control module 10 and the DO signal output from the slave control module corresponding to the battery pack with a temperature equal to or greater than 66°C, and can control the fire protection system 40 to execute the highest level of overheating strategy or thermal runaway strategy, thereby achieving dual protection for the lithium battery power system.

[0057] When CAN communication fails, the display and control module 10 cannot obtain battery information. Therefore, it cannot activate the fire suppression system 40 according to the over-temperature strategy or thermal runaway strategy. In this case, the fire suppression system 40 can be activated using the DO signal. When the battery pack temperature is equal to or greater than 66°C, the corresponding slave control module outputs a DO signal. Upon receiving this DO signal, the fire suppression system 40 activates and executes the highest level of over-temperature strategy or thermal runaway strategy. This enables the protection of the lithium battery power system in the event of CAN communication failure or a fault in the master control module 20.

[0058] This utility model provides a lithium battery energy storage system, including a battery management system and a fire protection system connected to a display and control module in the battery management system. The battery management system, for each battery cluster, includes: a slave control module corresponding to the battery packs in each cluster; a master control module connected to each slave control module via a CAN bus; and a display and control module connected to the master control module via its respective communication interface. Each slave control module further includes a DO interface for connecting to the fire protection system. The DO interface outputs a DO signal when the temperature of the corresponding battery pack is equal to or greater than a preset temperature. The fire protection system is activated using the DO signal in case of CAN communication failure. By adding a DO interface to each slave control module, and only increasing the wiring harness within the cluster, redundancy is added to the existing scheme of controlling the fire protection system with the display and control module. Under normal conditions, dual protection is achieved in case of overheating or thermal runaway. In case of CAN communication failure, the fire protection system can still be activated using the DO signal, ensuring the normal operation of the fire protection system, reducing the occurrence of battery fires or power system failures, and thus reducing economic losses.

[0059] An embodiment of a vehicle:

[0060] This utility model provides a vehicle including a lithium battery energy storage system.

[0061] The lithium battery energy storage system can be referred to in the aforementioned "An Embodiment of a Lithium Battery Energy Storage System". The relevant descriptions of the lithium battery energy storage system will not be repeated here.

[0062] The vehicle provided by this utility model can achieve the same beneficial effects as the lithium battery energy storage system in the aforementioned "An Embodiment of a Lithium Battery Energy Storage System", which will not be repeated here.

Claims

1. A lithium battery energy storage system, comprising a battery management system and a fire suppression system connected to a display and control module in the battery management system, wherein the battery management system includes, for each battery cluster: The system comprises a slave control module corresponding to the battery packs in each battery cluster, a master control module connected to each slave control module via a CAN bus, and a display and control module connected to the master control module via their respective communication interfaces. The slave control module further comprises a DO interface for connecting to the fire protection system. The DO interface is used to output a DO signal when the temperature of the corresponding battery pack is equal to or greater than a preset temperature; The fire protection system is used to activate using the DO signal in the event of CAN communication failure.

2. The lithium battery energy storage system according to claim 1, characterized in that, The DO interface is a dry contact interface.

3. The lithium battery energy storage system according to claim 1, characterized in that, The lithium battery energy storage system is used to determine CAN communication failure when the display and control module, the main control module, or the software malfunctions. Alternatively, if the CAN bus between the display control module and the main control module loses communication, it is determined that the CAN communication has failed. Alternatively, if the CAN bus communication between the master control module and each of the slave control modules is lost, it is determined that the CAN communication has failed.

4. The lithium battery energy storage system according to any one of claims 1-3, characterized in that, The lithium battery energy storage system also includes a liquid cooling system for cooling the battery pack, which is connected to the display and control module in the battery management system. The liquid cooling system is also used to connect the DO interface of each of the slave control modules; The liquid cooling system is used to activate the liquid cooling function using the DO signal in the event of CAN communication failure.

5. The lithium battery energy storage system according to claim 4, characterized in that, The lithium battery energy storage system also includes a fan connected to the display and control module in the battery management system for promoting heat exchange between the liquid cooling system and the surrounding air. The fan is also used to connect to the DO interface of each of the slave control modules; The fan is used to operate using the DO signal in the event of CAN communication failure.

6. A vehicle comprising a lithium battery energy storage system, the lithium battery energy storage system including a battery management system and a fire suppression system connected to a display and control module in the battery management system, the battery management system including, for each battery cluster: The system comprises a slave control module corresponding to the battery packs in each battery cluster, a master control module connected to each slave control module via a CAN bus, and a display and control module connected to the master control module via their respective communication interfaces. The slave control module further comprises a DO interface for connecting to the fire protection system. The DO interface is used to output a DO signal when the temperature of the corresponding battery pack is equal to or greater than a preset temperature; The fire protection system is used to activate using the DO signal in the event of CAN communication failure.

7. The vehicle according to claim 6, characterized in that, The DO interface is a dry contact interface.

8. The vehicle according to claim 6, characterized in that, The lithium battery energy storage system is used to determine CAN communication failure when the display and control module, the main control module, or the software malfunctions. Alternatively, if the CAN bus between the display control module and the main control module loses communication, it is determined that the CAN communication has failed. Alternatively, if the CAN bus communication between the master control module and each of the slave control modules is lost, it is determined that the CAN communication has failed.

9. The vehicle according to any one of claims 6-8, characterized in that, The lithium battery energy storage system also includes a liquid cooling system for cooling the battery pack, which is connected to the display and control module in the battery management system. The liquid cooling system is also used to connect the DO interface of each of the slave control modules; The liquid cooling system is used to activate the liquid cooling function using the DO signal in the event of CAN communication failure.

10. The vehicle according to claim 9, characterized in that, The lithium battery energy storage system also includes a fan connected to the display and control module in the battery management system for promoting heat exchange between the liquid cooling system and the surrounding air. The fan is also used to connect to the DO interface of each of the slave control modules; The fan is used to operate using the DO signal in the event of CAN communication failure.

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